In 21.12 CONTOLLING THE NUMBER OF DECIMALS WHEN PRINTING A FLOAT i assume there's a typo,
"If value is a float number, the command String.value( "%.2f", value ) returns a string where the value is rounded to contain 2 decimals. The number between dot and f defines the amount of decimals shown."
The bolded part should instead be "format"
Hi,
Thanks for your report. I've logged this issue in our internal issue tracker and we'll fix it in a future version of the course material.